From d66c570b144abac9d2518091f07e8fbf5099dd2a Mon Sep 17 00:00:00 2001
From: Pavel Emelyanov <xemul@openvz.org>
Date: Wed, 4 Feb 2009 13:40:31 +0300
Subject: [PATCH] --- yaml --- r: 131268 b: refs/heads/master c:
 ff08f76d738d0ec0f334b187f61e160caa321d54 h: refs/heads/master v: v3

---
 [refs]                       |  2 +-
 trunk/arch/x86/kernel/hpet.c | 12 ++++++++++--
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 2cdbec430a40..15eecd08fda7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7d8e23df69820e6be42bcc41d441f4860e8c76f7
+refs/heads/master: ff08f76d738d0ec0f334b187f61e160caa321d54
diff --git a/trunk/arch/x86/kernel/hpet.c b/trunk/arch/x86/kernel/hpet.c
index c761f914430a..388254f69a2a 100644
--- a/trunk/arch/x86/kernel/hpet.c
+++ b/trunk/arch/x86/kernel/hpet.c
@@ -897,13 +897,21 @@ static unsigned long hpet_rtc_flags;
 static int hpet_prev_update_sec;
 static struct rtc_time hpet_alarm_time;
 static unsigned long hpet_pie_count;
-static unsigned long hpet_t1_cmp;
+static u32 hpet_t1_cmp;
 static unsigned long hpet_default_delta;
 static unsigned long hpet_pie_delta;
 static unsigned long hpet_pie_limit;
 
 static rtc_irq_handler irq_handler;
 
+/*
+ * Check that the hpet counter c1 is ahead of the c2
+ */
+static inline int hpet_cnt_ahead(u32 c1, u32 c2)
+{
+	return (s32)(c2 - c1) < 0;
+}
+
 /*
  * Registers a IRQ handler.
  */
@@ -1075,7 +1083,7 @@ static void hpet_rtc_timer_reinit(void)
 		hpet_t1_cmp += delta;
 		hpet_writel(hpet_t1_cmp, HPET_T1_CMP);
 		lost_ints++;
-	} while ((s32)(hpet_readl(HPET_COUNTER) - hpet_t1_cmp) > 0);
+	} while (!hpet_cnt_ahead(hpet_t1_cmp, hpet_readl(HPET_COUNTER)));
 
 	if (lost_ints) {
 		if (hpet_rtc_flags & RTC_PIE)